Hand washing using soap. Soaps are water soluble sodium or potassium salts of fatty acids. They are made from fats and oils through chemical treatment with a strong alkali. They act as a surfactant - a chemical which aids the cleaning process through inhibiting surface tension in water | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / CRISTINA PEDRAZZINI |
Bildgröße: | 4224 px × 4248 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |